PETG is forgiving compared to acrylic — it bends at a lower temperature and it fails gradually rather than shattering. That also makes it easy to rush. This is the rhythm that produces bends with no flat spots, no scorching and no cloudiness.
Add at least 25 percent to your measured total. Cut generous and trim down.
Every builder ruins tubes learning the feel of the material. Running short mid-build is how a good run becomes a compromise.

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